Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ec976e70acb0d2…

MALICIOUS

PDF

76.2 KB Created: 2021-10-03 00:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3f3569d2715261db51c25617f3faab02 SHA-1: b7e70cb91647590d54704cd3bf7e3393a10cee96 SHA-256: c0ec976e70acb0d25e3987f8e7f8073fae8e68d929617ce228445350f6fb310d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://philabc.ru/uplcv?utm_term=business+plan+for+daycare+and+preschool+pdf PDF link annotation
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161416f4ea515a---27366185430.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/45686075725.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/34787005020.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/vumuwiwapexamimakewifebak.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353108caa3e---29794284459.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16154129da1914---25389226867.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210916/files/20210916013649.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/kosezikopagizanovobomugup.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/97273125960.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/dakaj.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/zudejebexigetexixopimowo.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/6b91e3eacdfc4422d813a4365f965cd1/98804822858.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/12855627255.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/ludom.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/d024c65da7705677de753765a32580a8/linunevijetodito.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/2767308899.pdfIn PDF document text
    • http://ccadl.com/files/20211002214552.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/a14bea428f9f19340a8935e28b253900/89695849532.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210924004929509334883.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/85880753905.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/71224398073.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/67382744202.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC204 18508 bytes
SHA-256: 79c856edbf32b0db253d91ecd3fb4f56adc77a1802fcc97ee2da55a72267cec1
font_01_sfnt_off0000f22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22F 10888 bytes
SHA-256: de7c4069bab77b72bf322014d85526f332c13099486b0d018443ba7bc0a47c73
font_02_sfnt_off00010b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1